Based off my experience today...which lasted several hours of researching this same issue on my 1993 Honda Shadow vt1100, it's most likely not oil but is rather fluid leaking out of the master cylinder that operates the clutch mechanism. I'm assuming you have a hydraulic clutch like mine. Directly above the kick stand is a metal plate that looks like it could be part of the engine but has an 8mm bolt holding it on at the bottom. Take that off and directly in front of you is your cylinder. You should inspect the lines and bleed the clutch lines to make sure that air isn't you issue. Beyond that you are where I am now.....did all that stuff but can't figure out my issue. Just thought I could catch you up at least that far and save you a little time.

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